Regarding Rights of my father and my grandfathers second wife

My grand father do the second Marriage after died of my grandmother. And the seond wife of my grandfather's she's age is 29 and my grandfather's age is 65 or 68. And second wife have alreday one child and his age is 6 years. My grandfather have two son of first wife. And one was died and after my father is remaining. Which types of rights in property have my father and my grandfather's second wife. ( i clarified that my grandfather's second wife has alredy child before marriage)